Penalver, Rafael A.
Arco Publishing, Inc., 1981
Buku Teks
Penalver, Rafael A.
Arco Publishing, 1984
Buku Teks
Indian Institute of Management, 1991
Buku Teks
Berridge, Virginia
McGraw-Hill, 2011
Buku Teks
by Phill Hanlon [and others]
McGraw-Hill, 2012
Buku Teks